• EROS home page
  The Earth Resources Observation System of the U.S. Geological Survey.

• Hubble Space Telescope Web Site
  NASA's Hubble Space Telescope Web site. Pictures galore!

• Solar and Heliospheric Observatory
  The Solar and Heliospheric Observatory is NASA's orbiting telescope that records solar activity.

• University of California's Museum of Paleontology
  A treat for those interested in paleontology.

• US Naval Observatory
  The U.S. Naval Observatory's Web site, providing all sorts of climatic data.

• Woods Hole Oceanographic Institution
  The Woods Hole Oceanographic Institution (WHOI) is the largest independent oceanographic research institution in the United States.